Lillian Cunningham, a journalist at The Washington Post, spent the last year scaling glaciers, cresting dunes, and slogging through mud in a hands-on exploration of America’s national parks. The result of her efforts is a series of portraits that reveal the little-known histories of America’s diverse natural oases. Field Trip also illuminates the modern issues facing the parks today, from wildfires in Yosemite to the uncertain status of Native Americans in Glacier National Park. Employing the storytelling skills honed in her podcasts Presidential (2016) and Constitutional (2017), Cunningham’s latest promises listeners a journey that is equal parts informative and enthralling. —Paulina Prosnitz